首页|Arabidopsis STAY-GREEN2 Is a Negative Regulator of Chlorophyll Degradation during Leaf Senescence

Arabidopsis STAY-GREEN2 Is a Negative Regulator of Chlorophyll Degradation during Leaf Senescence

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Chlorophyll (Chl) degradation causes leaf yellowing during senescence or under stress conditions.For Chl breakdown,STAY-GREEN1 (SGR1) interacts with Chl catabolic enzymes (CCEs) and light-harvesting complex Ⅱ (LHClI) at the thylakoid membrane,possibly to allow metabolic channeling of potentially phototoxic Chl breakdown intermediates.Among these Chl catabolic components,SGR1 acts as a key regulator of leaf yellowing.In addition to SGR1 (At4922920),the Arabidopsis thaliana genome contains an additional homolog,SGR2 (At4911910),whose biological function remains elusive.Under senescence-inducing conditions,SGR2 expression is highly up-regulated,similarly to SGR1 expression.Here we show that SGR2 function counteracts SGR1 activity in leaf Chl degradation; SGR2-overexpressing plants stayed green and the sgr2-1 knockout mutant exhibited early leaf yellowing under age-,dark-,and stress-induced senescence conditions.Like SGR1,SGR2 interacted with LHCll but,in contrast to SGR1,SGR2 interactions with CCEs were very limited.Furthermore,SGR1 and SGR2 formed homo-or heterodimers,strongly suggesting a role for SGR2 in negatively regulating Chl degradation by possibly interfering with the proposed CCE-recruiting function of SGR1.Our data indicate an antagonistic evolution of the functions of SGR1 and SGR2 in Arabidopsis to balance Chl catabolism in chloroplasts with the dismantling and remobilizing of other cellular components in senescing leaf cells.

Arabidopsis thalianastay-greenSGR1SGR2chlorophyll degradationleaf senescenceabiotic stress

Yasuhito Sakuraba、So-Yon Park、Ye-Sol Kim、Seung-Hyun Wang、Soo-Cheul Yoo、Stefan H(o)rtensteiner、Nam-Chon Paek

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Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Korea

Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA 24061, USA

Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 580-185, Korea

Department of Plant & Environmental Science, Hankyong National University, Ansung 456-749, Korea

Institute of Plant Biology, University of Zurich, CH-8008 Zurich, Switzerland

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This work was carried out with the support of "Cooperative Research Program for Agriculture Science & Technology DevelopmentRural Development Administration,Republic of Korea from the Swiss National Science Foundation

PJ0090180131003A_132603

2014

10.1093/mp/ssu045

分子植物(英文版)
中科院上海生命科学研究院植物生理生态所　中国植物生理学会

分子植物(英文版)

CSTPCDCSCDSCI
影响因子：0.659
ISSN：1674-2052
年,卷(期)：2014.7(8)
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